This works on Ubuntu 20 and Debian 11. Doesn't work on Debian 10
Switching the Wallpaper Managemnt
between the System's own Background setting in:
System Tools - Preferences - Settings - Background
and Compiz Wallpaper Management.
The wallpaper plugin needs to be enabled in:
Compiz Settings Manager - Utility - Wallpaper.
Each desktop can have its own background.
Image locations need to be added to the Images list.

Requires nemo-desktop activated, compiz managing windows
and using the gnome-flashback session.

The principle is the gsettings set command:
---------------------------------------------------------------
compiz

gsettings set org.gnome.gnome-flashback desktop false
gsettings set org.gnome.gnome-flashback.desktop show-icons false
gsettings set org.nemo.desktop show-desktop-icons true

system

gsettings set org.gnome.gnome-flashback desktop true
gsettings set org.gnome.gnome-flashback.desktop show-icons true
gsettings set org.nemo.desktop show-desktop-icons false
-----------------------------------------------------------------

Nautilus locations are very different; for system:
/org/gnome/desktop/background/show-desktop-icons false
one needs to try it out (I don't use nautilus at all)
to use nautilus remove the control file dependency: nemo
and repack the deb